In October, Wilde said publicly that she had fallen "blissfully, hopefully, wildly in love." She also shared that their love life wasn't lacking. "We have sex like Kenyan marathon runners," she said.

The two have been spotted most recently in Rome, where Wilde is filming the drama, The Third Person.

No word yet on a wedding date.

Wilde ended her eight-year marriage to Italian prince Tao Ruspoli in March 2011. They had no children. Sudeikis, who previously dated Mad Men actress January Jones, was married for four years to 30 Rock writer and producer Kay Cannon, before they split in 2008.